As for your other question, here's what the Perl FAQ (not to be confused with the Perl6 FAQ cited earlier) has to say:

Perl6 is not scheduled for release yet, and Perl5 will still be supported for quite awhile after its release. Do not wait for Perl6 to do whatever you need to do.

I have seen diverging opinions on how much of a jolt to programmers the advent of Perl 6 will be (see for example this PM thread), but I think that a solid knowledge of Perl5 is a better background for learning Perl6 than a weak or no knowledge of Perl5.